New to the forum and new to pools, I have had my pool for about four months now and have a few questions on test kits. My pool is in ground, white plaster, chlorine with Hayward AUTO chlorinator, cartridge filtration, sodium tetraborate add 3 months ago and Ozonator, I also have a 8 person spa, the total volume is around 16000 gals. My question is on the test kits and different ones that are available. It seems I am always off a little bit here or there on something, and want a more accurate way to measure stuff. The kit I have now looks similar to the ones mentioned, but it doesn't seem like the most accurate way to do buisness. Take a sample add a little of this and a little of that compare the color to a chart and gustamate it. I take a sample to the local pool store about once a month and noticed that their machine gives digital readings to the 10th place on everything. That is what I'm talking about! Are machines like these available to everyone? Do they cost more than my pool? Where would I get one? Just curiosity, I am thinking there has to be a more accurate way to do this beside taking a daily sample to the pool store. Plus I always feel like a cheap skate scince the pool store doesn't charge to run the samples and I usually don't buy any chemicals.